In a parliamentary system, the head of government is the de facto political leader of the state, and is answerable to the legislature (or only one chamber of it). Although there is often formal reporting relationship to a head of state, the latter usually acts as a figurehead who may only act as a chief executive, on limited occasions, either when receiving constitutional advice from the head of government or under specific provisions in a constitution.

In semi-presidential systems, the head of government may answer to both the head of state and the legislature, with the specifics provided by each constitution. A prominent example is the French Fifth Republic (1958–present), where the President appoints the Prime Minister but must choose someone who can get government business through, and enjoy support in, the National Assembly. When the opposition controls the National Assembly (and thus state funding and primary legislation), the President is in effect forced to choose a Prime Minister from the opposition party. In such cases, known as cohabitation, the Prime Minister (with the cabinet) controls domestic policy, with the President's influence largely restricted to foreign affairs.

A common title for many heads of government is prime minister. This is used as a formal title in many states, but also informally a generic term to describe whichever office is considered the principal minister under an otherwise styled head of state, as Minister — Latin for servants or subordinates — is a common title for members of a government (but many other titles are in use, e.g. chancellor and secretary of state). Formally the head of state can also be the head of government as well (ex officio or by ad hoc cumulation, such as a ruling monarch exercising all powers himself) but otherwise has formal precedence over the Head of Government and other ministers, whether he is their actual political superior (ruling monarch, executive president) or rather theoretical or ceremonial in character (constitutional monarch, non-executive president). Various constitutions use different titles, and even the same title can have various multiple meanings, depending on the constitutional order and political system of the state in question.

As political chief

In addition to prime minister, titles used for the democratic model, where there is an elected legislative body checking the Head of government, include the following. Some of these titles relate to governments below the national level (e.g. states or provinces).

Under a dominant head of state

In a broader sense, a head of government can be used loosely when referring to various comparable positions under a dominant head of state (especially is the case of ancient or feudal eras, so the term "head of government", in this case, could be considered a contradiction in terms). In this case, the prime minister serves at the pleasure of the monarch and holds no more power than the monarch allows. Some such titles are diwan, mahamantri, pradhan, wasir or vizier.

Indirectly referred as the head of state

In some cases, the head of state is a figurehead whilst the head of the government leads the ruling party. In some cases a head of government may even pass on the title in hereditary fashion. Such titles include the following:

An alternative formula is a single chief political body (e.g. presidium) which collectively leads the government and provides (e.g. by turns) the ceremonial Head of state See Head of state for further explanation of these cases.

Parliamentary heads of government

In parliamentary systems, government functions along the following lines:

The head of government — usually the leader of the majority party or coalition — forms the government, which is answerable to parliament;

Control over or ability to vote down fiscal measures and the budget (or supply); a government is powerless without control of the state finances. In a bicameral system, it is often the so-called lower house, e.g. the British House of Commons that exercises the major elements of control and oversight; in some others, e.g. Australia and Italy, the government is constitutionally or by convention answerable to both chambers/Houses of Parliament.

All of these requirements directly impact the Head of government's role. Consequently, they often play a 'day to day' role in parliament, answering questions and defending the government on the 'floor of the House', while in semi-presidential systems they may not be required to play as much of a role in the functioning of parliament.

Appointment

In many countries, the Head of government is commissioned by the Head of state to form a government, on the basis of the strength of party support in the lower house, in some other states directly elected by parliament. Many parliamentary systems require ministers to serve in parliament, while others ban ministers from sitting in parliament; they must resign on becoming ministers.

Removal

Heads of government are typically removed from power in a parliamentary system by

Dismissal — some constitutions allow a Head of state (or their designated representative, as is the case in some Commonwealth countries) to dismiss a Head of government, though its use can be controversial, as occurred in 1975 when then Australian Governor-General, Sir John Kerr, dismissed Prime Minister Gough Whitlam in the Australian Constitutional Crisis.

Death — in this case, the deputy Head of government typically acts as the head of government until a new head of government is appointed.

First among equals or dominating the cabinet?

Constitutions differ in the range and scope of powers granted to the head of government. Some older constitutions; for example, Australia's 1900 text, and Belgium's 1830 text; do not mention their prime ministerial offices at all, the offices became a de facto political reality without a formal constitutional status. Some constitutions make a Prime minister primus inter pares (first among equals) and that remains the practical reality for the Prime Minister of Belgium and the Prime Minister of Finland. Other states however, make their head of government a central and dominant figure within the cabinet system; Ireland's Taoiseach, for example, alone can decide when to seek a parliamentary dissolution, in contrast to other countries where this is a cabinet decision, with the Prime Minister just one member voting on the suggestion. The Prime Minister of Sweden, under the 1974 Instrument of Government, is a constitutional office with all key executive powers at his disposal; either directly, or indirectly through the collegial Government; whose members are all appointed and dismissed at the Prime Minister's sole discretion.

Official residence

The Head of government is often provided with an official residence, often in the same fashion as heads of state often are. The name of the residence is often used as a metonym or alternate title for 'the government' when the office is politically the highest, e.g. in the UK "Downing Street announced today..."

Similarly the Heads of government of (con)federal entities below the level of the sovereign state (often without an actual Head of state, at least under international law) may also be given an official residence, sometimes used as an opportunity to display its aspirations of statehood. E.g. in Belgium:

^Convention on the Prevention and Punishment of Crimes against Internationally Protected Persons, including Diplomatic Agents 1973, International Law Commission, United Nations. Retrieved on 2013-07-29.

^Not to be confused with a hotel, as a grand palace is called a hôtel in French.

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